JP7064082B2 - Micro speaker that can prevent the contact of the voice coil - Google Patents

Description

The present invention relates to a compact microspeaker capable of producing a sound when a signal voltage is applied, preventing the generation of contact sound, and preventing contact with a voice coil.

Micro speakers are mainly applied to devices capable of generating sound, such as mobile terminals, earphones, and speakers.
In a conventional microspeaker, a voice coil installed inside surrounds the outside of a magnet, and when a signal voltage is applied to the voice coil, an electric current is generated, and the acting force generated by the voice coil cutting a magnetic field line is used. The diaphragm is moved to generate an up-and-down amplitude motion, and the diaphragm moves the air to emit a corresponding sound.

Due to the small volume of such microspeakers, the space inside the microspeakers is limited and the gap between the voice coil and the magnet is small, resulting in a vertical amplitude motion along the magnet. , The voice coil and the magnet collide with each other, and when the micro speaker emits a sound, a slight contact sound is likely to be mixed.

Therefore, at present, a structure and a method for resolving the contact between the voice coil and the magnet are disclosed in, for example, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, Patent Document 5, and the like.
In these, an elastic connecting member is installed between the voice coil and the housing, and the elastic connecting member maintains a space between the voice coil and the magnet, so that the voice coil becomes a magnet in the process of generating vertical amplitude motion. I try not to hit them.
Such a method can effectively improve the contact noise generated between the voice coil and the magnet, but it is necessary to maintain a relatively large space between the voice coil and the housing so that the elastic connecting member can be installed. There is. Therefore, the volume of the micro speaker cannot be sufficiently reduced.

US Patent Publication No. 8995704 US Patent Publication No. 9813818 US Patent Publication No. 100003887 US Patent Publication No. 10448167 US Patent Publication No. 10299045

An object to be solved by the present invention is to provide a microspeaker that emits a sound when energized, prevents the generation of a contact sound, and can reduce the volume and prevent the contact of a voice coil.

The microspeaker capable of preventing contact of the voice coil of the present invention includes at least a housing, a diaphragm, a magnet, a voice coil, and an elastic connecting member, wherein the housing has a storage space in the center, and the storage space is provided. It has a first and second end facing each other, the diaphragm is installed at the first end of the accommodation space, the magnet has an axis perpendicular to the diaphragm, and the second end of the accommodation space. When the voice coil is separated from the diaphragm, one end of the voice coil is provided around the outside of the magnet, the other end is connected to the diaphragm, and a signal voltage is applied to the voice coil, the diaphragm is placed. Moved to generate an oscillating motion along the stretching direction of the axis, the elastically articulated member comprises at least one frame and at least one elastic member, the frame being used to mount the voice coil. The elastic member is connected between the frame and the magnet to maintain a distance between the voice coil and the magnet, and the voice coil moves in the direction of contacting and separating from the axis when the voice coil performs the amplitude motion. Suppress the runout width.

In one embodiment, the frame is composed of a plurality of support frames, the support frames are separated from each other, and the elastic member is installed between each support frame and a magnet.

In one embodiment, the support frames separated from each other are further connected to each other by using a connecting rod.

In one embodiment, the magnet is a planar rectangle, includes two opposing long sides and two opposing short sides, and an arc-shaped side is formed at a position where each long side and each short side are adjacent to each other. Ru.

In one embodiment, each support frame is installed outside each arc side and each elastic member is articulated between each support frame and each arc side.

In one embodiment, the support frame is installed outside the two long sides and the two short sides, and the elastic member is installed between each support frame and each long side and each short side. ..

In one embodiment, an adhesive layer is provided on the outer surface of the magnet.

In one embodiment, the housing is composed of a loading seat and a housing body, the first end is formed on the loading seat and used for mounting the diaphragm, and the second end is on the housing body. It is formed and is provided around the outside of the voice coil, and the loading seat is mounted above the housing body.

In one embodiment, the diaphragm is integrally molded with the loading seat body, and the diaphragm is formed on the loading seat body by injection molding a silicon material.

According to the present invention, the voice coil and the magnet are kept at a distance by the elastic connecting member, and when the voice coil performs an amplitude motion outside the magnet, it is possible to prevent the voice coil and the magnet from coming into contact with each other, so that a contact sound is generated. Can be prevented.
Further, since the distance between the voice coil and the housing can be reduced as compared with the case where the elastic connecting member is provided between the voice coil and the housing, the entire microspeaker can be made smaller to meet the demand for further miniaturization. can.

It is sectional drawing of the micro speaker which shows Example 1 of this invention. It is sectional drawing of the elastic articulation member and a magnet which concerns on Example 1 of this invention. It is a perspective view of the elastic articulation member and the magnet which concerns on Example 1 of this invention. It is a top view of the elastic articulation member and the magnet which concerns on Example 1 of this invention. It is an exploded perspective view of the elastic articulation member and the magnet which concerns on Example 1 of this invention. It is a perspective view of the elastic articulation member which concerns on Example 2 of this invention. It is a perspective view of the elastic articulation member and the magnet which concerns on Example 3 of this invention. It is an exploded perspective view of the elastic articulation member and the magnet which concerns on Example 3 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 show Example 1 of the present invention.
In this embodiment, the microspeaker 10 capable of preventing contact with the voice coil includes a housing 20, a diaphragm 30, a magnet 40, a washer 50, a voice coil 60, and an elastic connecting member 70.

The housing 20 has an accommodation space 21 in the center, has a first end 22 and a second end 23 in the accommodation space 21, and the first end 22 and the second end 23 face each other.
In this embodiment, the housing 20 is composed of a loading seat 24 and a housing body 25, the first end 22 is located on the loading seat 24, the second end 23 is located on the housing body 25, and the loading seat 24 is located. It is attached so as to be above the housing body 25.

The diaphragm 30 is installed at the edge portion of the first end 22 of the accommodation space 21.
In this embodiment, the diaphragm 30 is integrally molded with the loading seat 24 by an injection molding method of a silicon material. In the molding method, the loading seat 24 is first placed in a first mold (conventional technique, not shown), a liquid silicon material is injected into the first mold, and the silicon material is the first. By being cooled and molded in the mold, the diaphragm 30 is directly molded on the loading seat 24, and the diaphragm 30 and the loading seat 24 are integrally molded.

The magnet 40 is installed at the second end 23 of the accommodation space 21 and is covered by the housing 20, and the magnet 40 and the diaphragm 30 are separated from each other. Further, the magnet 40 includes an axial center 41 perpendicular to the diaphragm 30.
In this embodiment, the magnet 40 is substantially a planar rectangle, includes two long sides 42 and two short sides 43, and each long side 42 and each short side 43 are adjacent to each other and are adjacent to each other. An arcuate side 44 is formed between the long side 42 and each short side 43.
The washer 50 is installed so as to cover the magnet 40.

The voice coil 60 is installed in the accommodation space 21, one end of the voice coil 60 is connected to the diaphragm 30, the other end surrounds the outside of the magnet 40 and the washer 50, and there is a gap 61 between the magnet 40 and the voice coil 60. It is formed.
The voice coil 60 is formed by winding a metal wire such as an enamel wire, a copper wire, an aluminum wire or a copper clad aluminum wire, and is used for connecting two ends of the enamel wire or the like to an external power source (conventional art). Therefore, the explanation is omitted here).
When a signal voltage is applied to the voice coil 60, a current is generated, and the diaphragm 30 is moved by utilizing the acting force generated by the voice coil 60 cutting the magnetic field line to generate an amplitude motion along the stretching direction of the axis 41. The diaphragm 30 moves the air to make a corresponding sound.

The elastic articulated member 70 is articulated between the magnet 40 and the voice coil 60, and the elastic articulated member 70 holds an appropriate distance 61 between the magnet 40 and the voice coil 60.
The elastic connecting member 70 is composed of at least one frame 71 and at least one elastic member 72.
In this embodiment, the frame 71 is composed of four support frames 73, each support frame 73 is installed at intervals from each other, and each support frame 73 is phased on the outer side of each arc-shaped side 44 of the magnet 40. An elastic member 72 is installed adjacent to each other and between each support frame 73 and the arcuate side 44. Each support frame 73 is generally L-shaped (see FIG. 2) and includes an articulated side 74 and an upright side 75, the articulated side 74 is located below the voice coil 60 and the upright side 75 is located outside the voice coil 60. Each support frame 73 is connected to the voice coil 60 by a method such as adhesive, high frequency, or injection molding.

Each elastic member 72 is connected between the connecting side 74 and the arcuate side 44. In this embodiment, the elastic member 72 is similarly formed between the articulated side 74 and the arcuate side 44 by an injection molding method using a silicon material. In the molding method, the support frame 73 and the magnet 40 are first placed in a second mold (conventional technique, not shown), and a liquid silicon material is injected into the molding space of the second mold. The elastic member 72 is formed by cooling the silicon material in the molding space and molding the material. Thereby, the elastic member 72 can be effectively coupled between the connecting side 74 and the arcuate side 44, and the shape of the elastic member 72 can be changed by changing the shape in the molding space.

Since the magnet 40 and the elastic member 72 are manufactured of different materials, in this embodiment, in order to effectively bond the elastic member 72 to the magnet 40 during the molding process, the magnet 40 is first coated or injection molded on the outer surface of the magnet 40. The adhesive layer 45 is formed by such a method. The adhesive layer 45 is formed using a silicon material, whereby the elastic members 72 are effectively interconnected with the adhesive layer 45 when the elastic member 72 is molded, and the adhesive force between the elastic member 72 and the magnet 40 is increased. Can be enhanced.

Therefore, after the signal voltage is applied to the voice coil 60, when the voice coil 60 performs an amplitude motion on the magnet 40, the elastic connecting member 70 causes the voice coil 60 and the magnet 40 to maintain a gap 61, and the voice coil 60 is used. It is possible to suppress the phenomenon that the magnet 40 swings to the left and right with respect to the axis 41, and effectively avoid the contact between the voice coil 60 and the magnet 40.

It should be mentioned that the larger the radius of each arcuate side 44 of the magnet 40, the larger the distance 61 between each arcuate side 44 and the support frame 73, and the larger the area of the elastic member 72. be. Therefore, by controlling the radius of the arcuate side 44, the distance 61 between the arcuate side 44 and the support frame 73 can be controlled, so that the shape of the elastic member 72 is changed according to the magnitude of the amplitude motion. Moreover, the distance 61 between the voice coil 60 and the magnet 40 can be effectively maintained. At the same time, the distance between the housing 20 and the voice coil 60 can be reduced, effectively reducing the overall volume of the microspeaker 10.

FIG. 6 shows Example 2 of the present invention.
In order to save the molding time of the plurality of elastic members 72 between the plurality of support frames 73 and the magnets 40, in this embodiment, connecting rods 76 are installed between the support frames 73 spaced apart from each other. The two ends of each connecting rod 76 are connected to the support frame 73, respectively.
As a result, when the support frame 73 is inserted into the above-mentioned second mold, it is not necessary to insert each support frame 73 into the second mold one by one, and the support frame 73 can be inserted into the second mold at the same time. Can be shortened in the time to put in the second mold.
After molding each elastic member 72, each connecting rod 76 is fastened between two support frames 73, or the connecting rods 76 are removed from between the support frames 73 (see FIG. 4) to reduce the weight of the frame 71. You can choose to make it lighter.
Other structures are the same as in Example 1.

7 and 8 show Example 3.
In this embodiment, support frames 73'are installed outside the two long sides 42 and the two short sides 43 of the magnet 40, and are located between each support frame 73', each long side 42, and each short side 43. Are connected to each other using the elastic member 72'.
As a result, when the voice coil 60 performs an amplitude motion outside the magnet 40, a distance 61 is similarly maintained between the voice coil 60 and the magnet 40 through the elastic member 72'to prevent contact from occurring, and the voice coil 60 is prevented from occurring. It is possible to effectively improve the sound generated by the magnets 40 and the magnets 40 coming into contact with each other.
Other structures are the same as in Example 1.

Summarizing the above, the elastic connecting member 70 is installed between the voice coil 60 and the magnet 40, and the plurality of support frames 73, 73'and the plurality of elastic members 72, 72'are formed on the plurality of arcuate sides 44 of the magnet 40. Whether installed on the outside or on the outside of the two long sides 42 or the two short sides 43 of the magnet 40, both allow the voice coil 60 and the magnet 40 to effectively maintain spacing. When the voice coil 60 performs an amplitude motion outside the magnet 40, it is possible to effectively avoid contact between the voice coil 60 and the magnet 40. At the same time, the distance between the voice coil 60 and the housing 20 can be reduced, the overall volume of the microspeaker 10 can be effectively reduced, and the demand for further miniaturization can be met.

The above is merely an explanation of the embodiments of the present invention, and the scope of rights of the present application cannot be limited by this. Any modification or modification that does not deviate from the gist of the present invention is included in the scope of the right of the present invention.

10 Micro speaker 20 Housing 21 Accommodation space 22 1st end 23 2nd end 24 Loading seat body 25 Housing body 30 Diaphragm 40 Magnet 41 Axis center 42 Long side 43 Short side 44 Arc-shaped side 45 Adhesive layer 50 Washer 60 Voice coil 61 Spacing 70 Elastic connecting member 71 Frame 72, 72'Elastic member 73, 73' Support frame 74 Connecting side 75 Upright side 76 Connecting rod

Claims (9)

A microspeaker capable of preventing contact of the voice coil, including at least a housing, a diaphragm, a magnet, a voice coil, and an elastic coupling member.
The housing has a central containment space, with first and second ends facing the containment space.
The diaphragm is installed at the first end of the containment space.
The magnet has an axial center perpendicular to the diaphragm, is installed at the second end of the accommodation space, and is separated from the diaphragm.
When one end of the voice coil is provided around the outside of the magnet and the other end is connected to the diaphragm and a signal voltage is applied to the voice coil, the diaphragm is moved and along the extending direction of the axis. Generates amplitude motion,
The elastic articulated member comprises at least one frame and at least one elastic member, the frame being used for mounting the voice coil, the elastic member being articulated between the frame and the magnet, the voice. A distance is maintained between the coil and the magnet, and when the voice coil performs the amplitude movement, the swing width in the direction in which the voice coil comes into contact with the axis is suppressed.
A micro speaker that can prevent contact with the voice coil. The first aspect of the present invention is characterized in that the frame is composed of a plurality of support frames, the support frames are separated from each other, and the elastic member is installed between each support frame and a magnet. Micro speaker that can prevent the contact of the voice coil of. The microspeaker according to claim 2, wherein the support frames separated from each other are further connected to each other by using a connecting rod . The magnet is a plane rectangle, includes two opposing long sides and two opposing short sides, and an arc-shaped side is formed at a position where each long side and each short side are adjacent to each other. A micro speaker capable of preventing contact with the voice coil according to claim 2 . The contact of the voice coil according to claim 4 , wherein each support frame is installed outside each arc-shaped side, and each elastic member is connected between each support frame and each arc-shaped side. Micro speaker that can prevent. The feature is that the support frame is installed on the outside of each of the two long sides and the two short sides, and the elastic member is installed between each support frame and each long side and each short side. A micro speaker capable of preventing contact with the voice coil according to claim 4 . The micro speaker capable of preventing contact with the voice coil according to claim 1 , wherein an adhesive layer is provided on the outer surface of the magnet . The housing is composed of a loading seat and a housing body, the first end is formed on the loading seat and used for mounting the diaphragm, and the second end is formed on the housing body and said. The microspeaker according to claim 1 , wherein the loading seat is provided around the outside of the voice coil and the loading seat is attached above the housing body . The contact of the voice coil according to claim 8 , wherein the diaphragm is integrally molded with the loading seat body, and the diaphragm is formed on the loading seat body by injection molding a silicon material. Micro speaker that can be prevented.

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